Commit 79010860 authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf test: Add a new test for perf stat cgroup BPF counter 



  $ sudo ./perf test -v each-cgroup
   96: perf stat --bpf-counters --for-each-cgroup test                 :
  --- start ---
  test child forked, pid 79600
  test child finished with 0
  ---- end ----
  perf stat --bpf-counters --for-each-cgroup test: Ok

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20220916184132.1161506-5-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 8a92605d

tools/perf/tests/shell/stat_bpf_counters_cgrp.sh

0 → 100755
+83 −0
Original line number Diff line number Diff line 
#!/bin/sh

# perf stat --bpf-counters --for-each-cgroup test

# SPDX-License-Identifier: GPL-2.0



set -e



test_cgroups=

if [ "$1" = "-v" ]; then

	verbose="1"

fi



# skip if --bpf-counters --for-each-cgroup is not supported

check_bpf_counter()

{

	if ! perf stat -a --bpf-counters --for-each-cgroup / true > /dev/null 2>&1; then

		if [ "${verbose}" = "1" ]; then

			echo "Skipping: --bpf-counters --for-each-cgroup not supported"

			perf --no-pager stat -a --bpf-counters --for-each-cgroup / true || true

		fi

		exit 2

	fi

}



# find two cgroups to measure

find_cgroups()

{

	# try usual systemd slices first

	if [ -d /sys/fs/cgroup/system.slice -a -d /sys/fs/cgroup/user.slice ]; then

		test_cgroups="system.slice,user.slice"

		return

	fi



	# try root and self cgroups

	local self_cgrp=$(grep perf_event /proc/self/cgroup | cut -d: -f3)

	if [ -z ${self_cgrp} ]; then

		# cgroup v2 doesn't specify perf_event

		self_cgrp=$(grep ^0: /proc/self/cgroup | cut -d: -f3)

	fi



	if [ -z ${self_cgrp} ]; then

		test_cgroups="/"

	else

		test_cgroups="/,${self_cgrp}"

	fi

}



# As cgroup events are cpu-wide, we cannot simply compare the result.

# Just check if it runs without failure and has non-zero results.

check_system_wide_counted()

{

	local output



	output=$(perf stat -a --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, sleep 1  2>&1)

	if echo ${output} | grep -q -F "<not "; then

		echo "Some system-wide events are not counted"

		if [ "${verbose}" = "1" ]; then

			echo ${output}

		fi

		exit 1

	fi

}



check_cpu_list_counted()

{

	local output



	output=$(perf stat -C 1 --bpf-counters --for-each-cgroup ${test_cgroups} -e cpu-clock -x, taskset -c 1 sleep 1  2>&1)

	if echo ${output} | grep -q -F "<not "; then

		echo "Some CPU events are not counted"

		if [ "${verbose}" = "1" ]; then

			echo ${output}

		fi

		exit 1

	fi

}



check_bpf_counter

find_cgroups



check_system_wide_counted

check_cpu_list_counted



exit 0